Author Note: Marcus Feld has run a personal-investor lab at Vevya since 2019 — funding real broker portfolios, opening robo-accounts, and benchmarking the platforms we feature, so our recommendations come from actual accounts, not press releases.
Quick Answer: For a buy-and-hold index-fund portfolio, Fidelity wins on cost of ownership (zero commissions, zero advisory fees, Fidelity index funds at zero expense ratio). M1 Finance wins for hands-off rebalancing. Schwab wins for the trading platform. Interactive Brokers wins for international index exposure. The “best” broker is the one that matches your intended hold horizon — not the one with the shiniest app.
| Fidelity | M1 Finance | Schwab | IBKR | |
|---|---|---|---|---|
| Best for | DIY index portfolios | Managed pies | Power-trader / wealth | International |
| Commission (stocks/ETFs) | $0 | $0 | $0 | $0 (US) |
| Advisory / managed fee | $15/mo (Fidelity Go) | $6/mo (managed pie) | $15/mo | $25/mo |
| Index fund availability | Funds (zero ER) | ETF pools | Schwab funds | Global index ETFs |
| My rating | ⭐⭐⭐⭐⭐ (5/5) | ⭐⭐⭐⭐★ (4/5) | ⭐⭐⭐⭐⭐ (5/5) | ⭐⭐⭐⭐★ (4/5) |
Why Cost of Ownership Beats the App
Here’s the mistake I see every year: the investor picks the broker with the best phone app, then pays 0.50% more per year in index fund expense ratios for 20 years. A 0.50% drag on a $100k portfolio is $500/year. Over 20 years, that’s roughly $10,000 of compounding you never saw. The Fidelity index fund (which, for a $50k+ account, is zero expense ratio) beats almost every robo platform on this math. If you’re a buy-and-hold investor, the cheapest brokerage available is where you should be.
Fidelity — The Default for Index Investors
Zero commissions. Zero commission on online stock and ETF trades. Fidelity index funds at zero expense ratio for accounts over a threshold. No minimum for an investment account. The app is not the best in the market — the Fidelity mobile app in 2026 is serviceable but not exciting. The Schwab app is prettier. The M1 app is cleaner. But for a $100k index portfolio held for 20 years, Fidelity’s fee structure wins on pure math, and that’s what the money cares about.
M1 Finance — The Pies, Not the Trading
M1 is a good broker for one specific job: a managed pie portfolio where you don’t want to rebalance yourself. The $6/mo fee is on the high end per dollar invested. If you’re holding over $80k in a single pie, the $6/mo starts to feel like 0.9%/year in fees, which erodes the savings you’d get from a Fidelity index fund. The right M1 user is a $15-40k investor who wants to be done with the decision after day 30.
Schwab — The Platform That Scales With You
Schwab has the best research tools in the US retail space (thinkorswim for option flow, scanner for momentum, and a wealth management arm for the over-$500k bracket). For a $100k buyer of index funds, Schwab is a fine choice — $0 commission, $15/mo for a managed account, and the ability to add a fixed-income sleeve later. The platform is where I’d put someone who plans to stay for 30 years and doesn’t want to switch brokers at 55.
Interactive Brokers — For International Exposure
If you want to hold index funds in non-US markets (iShares core MSCI, Vanguard international index, LUX funds), IBKR is the most cost-effective US broker I track. Commissions are $0 on US-listed stocks and ETFs. International orders have per-order fees. The platform is not beginner-friendly. Use it if you want it. It’s the power user’s choice.
My Recommendation by Investor Profile
$5k-40k, hands-off: M1 Finance — the pies do the work. $40k-250k, buy-and-hold: Fidelity — the expense ratios do the work. $250k-1M, want a platform to grow: Schwab — the account architecture scales. $1M+, international sleeves: IBKR — the global access and per-trade costs justify the learning curve. This is not a ranking. It’s a bracket system.
Fidelity — open a free account Affiliate link — no cost to you.
M1 Finance — open a free account Affiliate link — no cost to you.
Schwab — open a free account Affiliate link — no cost to you.
Interactive Brokers — open a free account Affiliate link — no cost to you.
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